According to the NCERT text, the 'test tube baby programme' involves in vitro fertilisation (IVF) followed by embryo transfer (ET). Specifically, the transfer of a zygote or early embryo (with up to 8 blastomeres) into the fallopian tube is called Zygote Intra Fallopian Transfer (ZIFT). In contrast, GIFT involves the transfer of an ovum for in-vivo fertilisation.